Hiroshima, Japan climate
Average temperatures, precipitation and all-time records for Hiroshima, Japan, with every day graded against ~45 years of local climate history (1981–2026). Its warmest month is August, averaging a high of 30°C, and its coldest is January, with an average low of -1°C.
Hiroshima is the capital of Hiroshima Prefecture in Japan. As of June 1, 2019, the city had an estimated population of 1,199,391. The gross domestic product (GDP) in Greater Hiroshima, Hiroshima Urban Employment Area, was US$61.3 billion as of 2010. via Wikipedia
How today compares
Latest recorded day: 2026-07-21. Each reading placed on Hiroshima, Japan's own ±7-day seasonal distribution.
Hiroshima average temperatures by month
Typical daily high and low, and average precipitation, for each month in Hiroshima, Japan, based on 1981–2026 records. The wettest month is June (8 mm on an average day).
| Month | Avg high | Avg low | Avg precip |
|---|---|---|---|
| January | 6°C | -1°C | 3 mm |
| February | 8°C | -1°C | 3 mm |
| March | 12°C | 1°C | 3 mm |
| April | 17°C | 6°C | 5 mm |
| May | 22°C | 11°C | 5 mm |
| June | 25°C | 16°C | 8 mm |
| July | 29°C | 21°C | 8 mm |
| August | 30°C | 22°C | 5 mm |
| September | 27°C | 18°C | 5 mm |
| October | 21°C | 11°C | 3 mm |
| November | 15°C | 5°C | 3 mm |
| December | 9°C | 0°C | 3 mm |
Each bar spans the 10th-percentile daily low to the 90th-percentile daily high (the range most days fall within), coloured cold → hot on a shared -23°C to 46°C scale, so the whole year's rhythm reads at a glance.
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Record extremes
- Hottest day on record: 38°C on 1994-08-08
- Coldest day on record: -10°C on 1981-02-26
Percentiles compare each day to Hiroshima, Japan's own history, so grades are relative to this location: a “Near Record” day here isn't the same temperature as elsewhere. How the grades work →